Overview of Human eye and wonderful world| class 10th science| defects in eyes| mindmap

class 10th science| mindmap of human eye The human eye is one of the most valuable and sensitive sense organs, which enable us to see the colourful world around us. It is just like a photographic camera. The lens system of the eye forms an image of the object on a light sensitive screen. Human Eye And Colourful World THE HUMAN EYE Human Eye And Colourful World of Class 10 The human eye is one of the most valuable and sensitive sense organs, which enable us to see the colourful world around us. It is just like a photographic camera. The lens system of the eye forms an image of the object on a light sensitive screen. STRUCTURE AND WORKING OF HUMAN EYE: The human eye has the following parts : Cornea : It is the transparent spherical membrane covering the front of the eye. Iris : It is the coloured diaphragm between the cornea and lens. Pupil : It is the small hole in the iris. Eye lens : it is a transparent lens made of jelly like material. Ciliary muscles : These muscles hold the lens in positions. Retina : It is the back surface of the eye. Blind spot : It is the point at which the optic nerve leaves the eye. An image formed at this point is not sent to the brain. Aqueous humor : It is clear liquid region between the cornea and the lens. Vitreous humor : The space between eye lens and retina is filled with another liquid called vitreous humor. WORKING OF THE HUMAN EYE Light rays coming from the object to be seen can enter the eye through pupil and fall on the eye lens. The eye lens being convex, forms a real and inverted image on the retina. The light sensitive cell of the retina gets activated upon illumination and generate electric signals. These signals are sent to the brain via the optic nerve. The brain interprets these signals and finally gives rise to the sensation of vision.